Apparatus for indicating the elongation of tubular elements combined with safety devices in steam generators



Deco 14.1926. Lei-1,097

' J V. BL-.OMQUIST ET AL APPARATUS FOR IQNDICATING'THE ELONGATION OF TUBULAR ELEMENTS coiainsn 7 WITH SAFETY DEVICES IN STEAM GENERATORS Filed Oct. 12. 1923 Sheets-Sheet 1 y EW J. V. BLOMQUIST ET AL APPARATUS FOR INDICATING THE ELONGATION 0F TUBULAR ELEMENTS COMBINED WITH SAFETY DEVICES IN STEAM GENERATORS Filed Oct. 12. 1923 3.Sheets-Sheat 2 JKB/OM r KPH/ 2 0 A3. wk '5 Dec.l4.1926.

- BLOM APPARATUS FOR INDICATING E E T EBQkAR WITH SAF DE INSTEAM GENER ELEMENTS COMBINED ATORS 3 She'ets Sheet :5

LO'MG'A VIGES ed Oct J V TH ETY Patented Dec. 14, r

iii raaarus iron mmcmmems ELoiIGATIo nterit s memm poivrsms Jormri vm'ronstolvroursr AND KARL :FREDRIK wE'S'SBeAs,. e'SsOeKs' -JM,SWEDEN, i

re e es mesa S GE E A Q a masses Q 2 *s s iim m a a a Our invention is directed particularly ""to i improvements, in suolrsteam generators in which the steam is L generated in frotating ;or

elements, therefore, are generally supported in their bearingsin suchanvay that "they are held fast in their axial direction atone end while they are permitted to freely yex-. pand at the opposite end.- i Y According to thepresent' invention; this expansion of the tubular'elements is'utilized partly'for determining whether anextensive depositiof scale-has takenplacein the tuv bular elen'1ents','inwhich case onaccount of I the reduced transference of 'liez ttliey will assume. 'a' higher. temperature and -a greaterlength'than when they are clean, and partly,

when atubular element by accidental short- I ness of water 9.1501 assumes a higher temperature and 'an abnormal length, fonmak} ing: it possible forthe attendant's'elearly to observe such dangerous expansion and in time reduce the steam pressure, for instance by easing the safety valve,'thuspreventing thedanger of explosion v For this purpose a po nter or index' isi 7 provided at the free end of the tubular ele ments; said'pointer being-arranged in such" a way that it is moved by said element'wh'en expanding and indicates the elongation of" the tubular elementon -'a scale. ,According' to the 'inventionthis"pointer *is also a1 ranged in such a way'that, it causes the;

steam pressure to be automatically lowered at an incidental shortness of water either by closing anelectricyc rcuit as soon as the elongation reaches a-predeterminedi value,

whereby anelectromotor in said circuit is acted upon to ease the safety valve by means of a "suitable mechani'sm', or, by directly opening a special valve, through which'the I expands unduly on account of deposit "of ointer will steam in the tubular element or the generator' escapes.

The invention is illustrated in the-accom panying drawings in which Fig. 1isalongitudinal section through a rotary tubular element of "a steam generator having a pointerin the shape of a 'bell crank'lever -and' an electricj easing device for thesafety axially movable pointer adapted directly to r hai pe al valve; for 'lettingl' ou't the steam: r h ranged in a common furnace.

rality oftubular elements therein.i- In Fig 1 .the' rotary-tubular element is p pre've'nfted from moving axially by: means jof the bearing 2 while the opposite end of said' element isfr'eely movable in'the bearg p n 4 S apcd as a'lbell crank Figl lt'rans verse" cross" section plurality of tubular eleme'ritsar! valve. "-Fig. 2 shows va'simil'ar viewwith' an? is horizontal sectional'lview of I the common furnace taken -aboye";the;p1u-- i leverisr'estingagainst an'edge-on the end" v of the'tubular element" andsaidpointert-f is made to traveli o'ver'a scale 5 thus indicat ing the elongation ofgthe tubular element;

Ifthe latter: expands over a predetermined I limit on account ofitoo extensive deposit of; scale'or'of shortness ofawaterg the pointer wlll close thegelectri'c contact 6- thereby starting the ele'ct'romotor' 7 which-latter roe-i "instance" by means of, a screw 8 and a crank '9 acts upon a safety valve 10 for easingthe same, said-safety valvebeing'conneeted with j the steam sp'aceof'the generator." It is obvious that the automatic action upon'the 1 safety valve may be dispensed with, as the safety valve,'of icourse, maybe acted upon pointer.

as is yhand according to the deflection of the f v The forin' shown in Fig/'2 coiupi'ises pointer movable in'the longitudinal direc tion of the tubular element and adapted di-i rectly to open a special valve, through I which the steam escapes at incidental short- .ness off'water inthefl tubular-element 11.

The latter is iheldfast; at one end by the bearing 12 so that it cannot move axially,

"while the oppositegend of the same is free to slide in the bearing '13. r A pointer 14 rests against an edge on the tubular element'and indicates the elongation of the same on ascale 1'5. If the tubular: element scale or shortness of water the open the valve l6j'connected wit the steam spacefof the generator whereby the steam in tion upon the safety valve may be dispensed T of the pointer.

' adapted tohe driven by meshing ,g-e

r mounted in, a: common furnaceQZ, but it i I w 7 n account of an increase of temperature 1 ,ures to ei sur elsafety may he tak or automatically,

With and [the satetyl 'alve may he operated i with the de'flexion by hand in acoorc'ia c In" Figs. 1 and2 the invention is she 'ii' a p ur y .wta y .t bula f m n all,

, Q, by a prime vmover 21, the elem ent's'beiii all e e es r esi in 9f eed -Mile is -o ments conta n ng a rotary layer 'oi wa'ter T devic r efii ii a li, fijiiieltlie steam pressure may oi 'courseyary nseyjeral Ways, the essential feature of thGlHV eDtLOIi consisting of a device. whereby the, expansion of the stearnjgeneratin:

ulo ular elen ients" on I be q err issz that'h r ss r ee en by hand 'HaYing thils described our intention We claim and desire to secure by Letters .77 1 Liz 11A o ry st m. gene a e? m, wh eh tubular element thereby; H

steam; generatedin a plurality oi? elements each oontalning rotary laye r of Water, compr sing, a furnac'e, aplurahty oi tubula r eleinents mounted in the turn-ace,

Water, coinprising, .a furnace,a pluralitygof tubular, elements mounted injche furnace, means to'produc'e a rotary layer of Water lllvwh element, each element h'aymgmeans for keepi'ng one end of said tubular element in a fixed position to preyentl'fi fifOlILmovmg ,i

axially, means for supporting thepther end to permit this latter end tqffreelyexpand inan axialgdirection, an indicator enacting with said latter endof the tubular. element,

means for, transmitting the movement of axial expansion of 'saidel'ement to said indicater,- a'ndvmeans combined with the indicater for automatically reducing steam pressure within the t'ubul'arelement upon reach;

ingthe safety limit of axial expansion. of .e

' the element. a

3. A; rotary steam generator in Which steam is generated in a tubular element jc'on;

tain ng a rotary layer of Water, comprising .municating with the, tubular gamete a irna ae t bi lelt me t mount d ing e fur; ace; means to rylayr of I V ositio a, 7 Water iii the element, means for keeping one end "of the element in a fixed position to prevent it from moving axiall upon elon gation duetoheat appl I tl eff "ther end of the 'le ii i eht to H permit {tenement at tliis latterend to freely R d re-t mean 9 ser edgi iae er tfli t n ee nil coacting with the free eiid (it the tubular element, "and; transmission I means I interposed i between the free end otthetubular element and indicator, garbage measures foxpan sioii of the tabular, e'iement is indicated y he ndiei m; Q 7' c. rotary s'team generator in which stear n is enerat d in tubular elements nontaining rotary-layer of w ter, cohipris; ing a furnace, a plurality of tuloiilareleiiients a layer, of water each ele'in means for r axial displaoemiit; oi: each of the rotati-ng el'eiiieiits at the one vend of the same means supporting i tlieotlier end of each of said 'eiejr qeas sothat each ,e le. ment can freely expand in axial Id at this latter end, an indicator coactihg w moun ed in the furnace, means to pr d1 e I a o i l the iree end of the tubular; eleiiiiitisg ,transmlssio'n meansinterposed between the free end {of each tubular element and the f corresponding indicatonfa safety yalye foi wai th time se en s an w rran s e ns ifd iiee h re ies ea ast i i ii d means bGlIigCQlllblllGCl with; the eprrspoiia i-ng indicator for easing the valve/at the i,

safety limit aXiare gpaaS-ieh of the cor- I'GSPOEdlIlg tuloular element.

5-: h ems g ne ated i p e' al trg i le elements each containing a .rOtary. layer s or Water, comprising, a a plurality of bu a e me ts m u ftd. i t frame means to produce a rotarylayer of ater 1n- .eac h element, each element having means nt tha wi t ii ma aeiially, es jsupporting the other end'to permeate el ment to freel y an axial dlrectiofi at thislatter end,a movable indicator, tr m ss- 0 m an ufqritmi m tt st th m i t 9 aid-i d t a a y; i li onnieans for valve, the controlling means beiiig, combined iiivith vthe .and actin'g in the movemq t ief sa e ql ifi li yei t lsa .l' i i tubular element.

names to this specification.

some

31st; i

r tary. g t 'i i s ii i i hi KARL REDRIK WEss L'A In testimonywhereof, we have signed our I ment er axial expan'sion a: the tu u ar an i 

